Stabilizing bituminous material

Abstract

Finely divided aerated concrete is added as a stabilising additive to composite bituminous material for the production of cast and rolled asphalt. This additive, which is preferably applied in a quantity of 0.3% to 10% by weight, is not inferior to known additives, and is superior to many of them, but is inexpensive as compared with known additives.

What is claimed is: 
     
       1. A composite bituminous material for the production of cast and rolled asphalt, comprising a stabilizing additive of finely divided, aerated concrete, wherein the grain size of said aerated concrete is in the range of 0 to 2.0 mms., wherein the aerated concrete essentially comprises from 40% to 65% by weight of sand, from 5% to 25% by weight of fine white lime, from 15% to 35% by weight of cement and from 0.5% to 10% by weight of calcium sulphate. 
     
     
       2. A composite material as claimed in claim 1, wherein the grain size of said aerated concrete is in the range 0 to 0.71 mm. 
     
     
       3. A composite material as claimed in claim 1, wherein the grain size of said aerated concrete in the range 0 to 0.30 mm. 
     
     
       4. A composite material as claimed in claim 1, wherein the quantity of said aerated concrete is 0.3% to 10% by weight, of said composite material. 
     
     
       5. A composite material as claimed in claim 1, wherein the quantity of said aerated concrete is 1.0% to 3.0% by weight, of said composite material. 
     
     
       6. A method of producing a composite bituminous material for the production of cast and rolled asphalt, the method comprising the step of admixing with said bituminous material a stabilizing additive of finely divided, aerated concrete, wherein the grain size of said aerated concrete is in the range of 0 to 2.0 mms. , comprising from 40% to 65% by weight of sand, from 5% to 25% by weight of fine white lime, from 15% to 35% by weight of cement and from 0.5% to 10% by weight of calcium sulphate. 
     
     
       7. A method as claimed in claim 6, wherein the grain size of said aerated concrete is in the range 0 to 0.71 mm. 
     
     
       8. A method as claimed in claim 6, wherein the grain size of said aerated concrete is in the range 0 to 0.30 mm. 
     
     
       9. A method as claimed in claim 6, wherein the aerated concrete is added in a quantity of 0.5 to 10% by weight of said composite material. 
     
     
       10. A method as claimed in claim 6, wherein the aerated concrete is added in a quantity of 1.0% to 3.0% by weight of the composite material.